OptiMate 5 6V/12VOptiMate 5 6V/12V SILVER series: 8-step 6V 4A / 12V 3A sealed battery saving charger & maintainer.The smarter charger for all 6V and 12V lead-acid batteries – great for deep cycle batteries!Ideal for 6V and 12V deep cycle and starter (SLI) lead-acid batteries found in the vehicles / craft and equipment above.Select the right charge voltage for your 6V or 12V lead-acid battery – Selection remains in memory even if AC power is lost.Fully automatic multi-step program brings the battery safely to full charge – Connect to the battery and OptiMate 5 6V/12V does the rest, no supervision required!AMPMATIC: Automatically adjusts current to match battery size and condition.Safe to leave connected. Full electronic protection.24/7 Maintains battery at full charge and good health.Saves your ‘dead’ battery from as low as 0.5V.S.O.H.: Tests battery state of health.Voltage safety check: will not charge if battery voltage does not match selection. Requires user confirmation.Green Technology: Energy saving technology, Stand-by power less than 0.5W and Efficient 24-7 battery maintenance.IP54: Weatherproof. Rated for use down to -40°C / -40°F.